Instructors Academic and Technical Branches, Boston Trade School 6.00 Vocational and Trade Assistants (Continuation School and Trade School for Girls)-- Per hour 1.25 Not to exceed per day 5.00 Aids (Continuation School and Trade School for Girls), per day: First year 3.50 Second year 4.00 Third and subsequent years 4.50 Helpers (Continuation School and Trade School for Girls), per day 4.50 Toolkeepers (Continuation School and Boston Trade School), per day: First year 3.00 Second year 3.50 Third and subsequent years 4.00 Special Instructors (Continuation School), per half-day 4.00 Special Assistants (Continuation School), per half-day 2.00 In this school, one two-hour session, together with such preparatory and follow-up work as may be required, shall constitute one-half day of service for teachers employed and paid on the basis of each half-day of service. Student Aids (Trade School for Girls), per day: First year 2.00 Second and subsequent years 2.50 Apprentice Helpers (Boston Trade School), per day: First year 4.00 Second and subsequent years 5.00 Special Shop Foremen and Foremen Shop Work, Department of Manual Arts, Boston Trade School, and Continuation School 10.00 Instructors, Shop Work, and Shop Instructors, Department of Manual Arts, Boston Trade School, and Continuation School 8.00 Shop Assistants, Department of Manual Arts, per day 6.00 School Nurses 4.00 School Physicians 4.00 Temporary Clerical Assistants, Latin, Day High, Continuation, Trade Schools and Day Elementary Schools, per day 3.50 and that the compensation of substitute and temporary teachers of other ranks than those enumerated herein shall be one four-hundredth part of the minimum salary of the respective ranks for each day of actual service.