// Create an arc shaped path:
var path = new Path({
    strokeColor: 'black'
});

path.add(new Point(40, 100));
path.arcTo(new Point(150, 100));

var offsets = []
for (var i = 0; i < 100; i++) {
	offsets[i] = (path.length/3) + i;
}

for (var i = 0; i < offsets.length; i++) {
	var point = path.getPointAt(offsets[i]);
    var circle = new Path.Circle({
		center: point,
		radius: 3,
		fillColor: 'red'
	});
}