Dr. Mac Cnlloch on the Chart of Shetland. 229 



induce those who may with authority undertake it, to commence 

 this necessary work ; or point outto unemployed officers in these 

 times of peace, a subject, from which, if they do not reap profit 

 or fame, they will assuredly acquire the thanks of many who, 

 like myself, have hourly hazarded their lives during a stormy 

 summer in a dangerous and anxious navigation. 



Shetland, August, 1821. 



Art. III. Account of the Method of illuminating the Clock 

 Dial OH the Steeple of the Tron Church in Glasgow. 



[We are surprised that no attempt has yet been made to illuminate the 

 dials of the London steeples, more especially as gas has been conducted 

 into several of our churches, and is almost always abundantly laid on 

 in the vicinity, for the purpose of lighting up church-yards, and thus 

 preventing the unhallowed visitations of a class of people, who, under 

 l)owerfiil patronage disgrace this metropolis and its suburbs, commonly 

 called resurrection men. Several of our city clocks are, as it were, con- 

 structed for the purpose ; such as those of St. Dunstan's in Fleet-street, of 

 Bow church in Cheapside, and others which project after the like fashion. 

 The Parish Church of St. James is also very advantageously situated for 

 nocturnal illumination, one of its four sides being seen from a number 

 of streets at the west end of the town. 



The following is a description of an ingenious plan successfully adopted at 

 Glasgow, under the superintendence of Messrs. John and Robert Hart. 

 We understand that the hours on the clock-dial, which fronts a long line 

 of streets, are legible at night to as great a distance as when the sun is 

 directly shining upon the tower.] 



The Tron steeple of Glasgow is of the Gothic order, consist- 

 ing of a square tower surmounted with a pyramidal top ; the 

 square tower terminates with a rail, or balcony, beneath which 

 the clock-dial is placed. 



The gas is introduced into the bottom of the steeple and convey- 

 ed up the wall by an iron pipe of one inch bore : this pipe passes 

 within eighteen inches of the wheel-work of one of the dials, and 

 a wheel, of double the diameter of the hour-wheel, is so placed 

 as to be driven by it ; this, of course makes one revolution in 

 twenty-four hours. The hours are engraved on the rim of this 

 wheel, and a moveable arm attached to it, which can be fixed 

 at any hour or half-hour by means of a clamp screw upon the 

 centre, and ii steady pin and holes in the rim ; this arm serves 



