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First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff (see sample For unto us a child is born). But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass. (Thanks to @phoog I only later noticed that the snippet came from Anton Bruckner's Ave Maria, WAB 6 which is scored for SAATTBB, see full score here).

In a two-staves SATB choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down is assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is to be sung by the Baritone/Bass-1, while the half notes are to be sung by the Bass-2. If the Baritones/Bass-1 are the ones singing the half notes, by convention the stems should go up.

When there is only one note head+stem in the staff (see measures 29-38 and 43-47) most likely both Bass-1 and Bass-2 are to sing the note in unison, especially in this score where in measure 30 the last 2 quarter notes C3 are notated with both up and down stems, guiding subsequent measures' interpretation. When in doubt, of course you need to consult the choir director.

First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff (see sample For unto us a child is born). But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass. (Thanks to @phoog I only later noticed that the snippet came from Anton Bruckner's Ave Maria, WAB 6 which is scored for SAATTBB, see full score here).

In a two-staves SATB choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down is assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is to be sung by the Baritone/Bass-1, while the half notes are to be sung by the Bass-2. If the Baritones/Bass-1 are to be the ones singing the half notes, the engraver would make the stems go up.

When there is only one note head+stem in the staff (see measures 30-38 and 43-47) most likely both Bass-1 and Bass-2 are to sing the note in unison, especially in this score where in measure 30 the last 2 quarter notes C3 are notated with both up and down stems, guiding subsequent measures' interpretation. When in doubt, of course you need to consult the choir director.

First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff (see sample For unto us a child is born). But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass. (Thanks to @phoog I only later noticed that the snippet came from Anton Bruckner's Ave Maria, WAB 6 which is scored for SAATTBB, see full score here).

In a two-staves choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down is assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is to be sung by the Baritone/Bass-1, while the half notes are to be sung by the Bass-2. If the Baritones/Bass-1 are the ones singing the half notes, by convention the stems should go up.

First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff (see sample For unto us a child is born). But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass. (Thanks to @phoog I only later noticed that the snippet came from Anton Bruckner's Ave Maria, WAB 6 which is scored for SAATTBB, see full score here).

In a two-staves SATB choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down is assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is to be sung by the Baritone/Bass-1, while the half notes are to be sung by the Bass-2. If the Baritones/Bass-1 are the ones singing the half notes, by convention the stems should go up.

When there is only one note head+stem in the staff (see measures 29-38 and 43-47) most likely both Bass-1 and Bass-2 are to sing the note in unison, especially in this score where in measure 30 the last 2 quarter notes C3 are notated with both up and down stems, guiding subsequent measures' interpretation. When in doubt, of course you need to consult the choir director.

First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff. But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass.

In a two-staves choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down may be assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is sung by the Baritone/Bass-1, while the half notes are sung by the Bass-2. If the Baritones/Bass-1 are the ones singing the half notes, the stems should go up.

First of all, in your circled example the two note heads have their own stems, so they're not sharing a single stem.

You didn't provide the staff assignment. SATB hymn scoring (mostly homophonic) normally uses only two staves and the Bass-clef staff would be shared by the Tenor and the Bass. Or in a more contrapuntal SATB scoring (such as Handel's Messiah) each voice has its own staff (see sample For unto us a child is born). But in your score we have two voices per staff, so the scoring seems to be for SSAATTBB. The third staff seems to be for the Tenors because there is an 8 below the G Clef, indicating they are to be sung an octave lower. Therefore, the Bass-clef staff must be for Bass 1 and Bass 2, or for Baritones and Bass. (Thanks to @phoog I only later noticed that the snippet came from Anton Bruckner's Ave Maria, WAB 6 which is scored for SAATTBB, see full score here).

In a two-staves choir notation, by convention the note stem pointing down would be for the Alto/Bass and the note stem pointing up would be for the Soprano/Tenor. Sometimes they overlap so the upper note whose stem pointing down is assigned to Alto/Bass. In your score, the notes with the stems pointing up are for the Baritone/Bass-1 and the the notes with the stems pointing down would be for the Bass-2. Similarly, for the other staffs, the notes with stems pointing up is for Soprano 1, Alto 1, and Tenor 1.

Measure 13 is instructive. You see one voice has a whole note E3 while the other voice has two half notes E3 and A2 with stems pointing down. This means the whole note is to be sung by the Baritone/Bass-1, while the half notes are to be sung by the Bass-2. If the Baritones/Bass-1 are the ones singing the half notes, by convention the stems should go up.